clark



(No Model.) 2 Sheets-Sheet 2,

4 E. M. CLARK.

APPARATUS FOR ROASTING ORES.

'No. 440,468. Patented Nov. 11, 1890.

WITNESSES H/af -46 A 7'7'ORNEYS m: NORRIS Perms cu, mow-umu.. wnsmucvou, n. c.

UNITED STATES EDWIN M. CLARK, OF BUTTE CITY, MONTANA, ASSIGNOR TO HIMSELF, EDWARD WV. CLARK, AND LAVVRENOE MULDOON, BOTH OF SAME PLACE.

APPARATUS FOR SPECIFICATION forming part of Letters Patent No. 410,468, dated November 11, 1890.

Application filed April 25, 1890. Serial No. 349,460. (No model.)

T (0% whom it may concern:

Be it known that I, EDWIN MARION CLARK, of Butte City, in the county of Silver Bow and State of Montana, have invented a new and Improved Apparatus for Oxidizing and Desulphurizing Ore, of which the following is a full, clear, and exact description.

It is well known that in the reduction of ores containing any considerable percentage to of sulphur it is first necessary to desulphurize the ore. This is usually done by roasting the ore by a sufficient heat and for a sufficient time to consume or destroy the sulphur.

The object of my invention is to accomplish this result in a short time and at little expense, and to this end my invention is intended as an improvement on the apparatus for which I filed application for Letters Patent of the United States, said application being serially numbered 327,182, and filed October 16, 1889, and allowed January 9, 1890.

My invention consists, chiefly, in the manner in which the water-jacket is applied to the air-pipe in the furnace and in the means for supporting the water-jacket and connecting it with the air-pipe. This construction will be hereinafter fully described, and pointed out in the claims.

Reference is to be had to the accompanying 3o drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a broken vertical longitudinal section of the apparatus as applied to an or- 5 dinary rotary calcining-furnace. Fig. 2 is a vertical cross-section 011 the line 2 2 of Fig. 1. Fig. 3 is an enlarged broken sectional plan View of the air-pipe and water-jacket, and Fig. 4 is a transverse section on the line l 4 of Fig. 3.

In the accompanying drawings, A is an ordinary Bruckner furnace, which rests upon pulleys or gears, and is rotated in a manner well known in the art, and which needs no detailed description, as the furnace forms no part of my invention. The furnace A is provided at each end with openings B, and extending through one of the said openings and running the entire length of the furnace is an air-pipe C, which is connected by the pipe C with an ordinary blower, so that the air PATENT OFFICE.

ROASTING ORES.

may be forced into the same. As the airpipe 0 will soon become red-hot from the intense heat of the furnace, it is provided with a water-jacket D, which incloses the same and extends the entire length of the furnace and through each of the open ends B, being suitably supported in said openings, as shown.

The Water-jacket D is provided at the ends with reducers E and E, which connect with the outlet-pipes F, said pipes being provided with suitable valves F to regulate the outflow of water. The reducer E is large enough to inclosethe elbow of the air-pipe O, and is provided with a suitable packing-washer E to make a tight joint. Water is supplied to the water-jacket D through a pipe G, which enters through one of the openings B of the furnace and is connected with the water- I jacket I) near the center of the furnace, as best shown in Fig. 1. The pipe G should be provided with an ordinary valve to regulate the flow of water through the same.

Opening from the bottom of the air-pipe G and through the water-jacket D are a series of jets a, through which the air may pass to the lower portion of the furnace, and another series of jets 12, extending from the air-pipe and through the water-jacket, said jets b pointing to ward the side of the furnace at an angle of about forty-five degrees from the jets to and toward the side to which the ore tends to roll on account of the rotation of the furnace.

In an ordinary large-sized Bruckner furnace I find twenty-nine jets a convenient number, fifteen of which discharge down ward and fourteen toward the side of the furnace. The airpipe 0 is stopped at one end by the cap d, and all the air blown into the pipe is thus forced out through the jets a and b and projected upon the ore in the bottom of the furnace. To form the jets a and b, the nipples e are screwed through threaded openings in the water-jacket D and in the pipe 0, said nipples having bevel threads upon the point and 5 upon the outer end, as shown best in Fig. 4,

so that they may be easily screwed into position.

In practice it was found that the pipe C and water-jacket D,as constructed in the manner 10 described in my former application, would bend from the weight of the Water in the water-jacket, and that the water-jacket would leak around the jets a and b. To obviate this difficulty, the Water-jacket D is provided throughout its length with a series of bolts f, which extend through the water-jacket and impinge upon the air-pipe (1, thus strengthening the parts and keeping the pipe and water-jacket in a fixed relation to each other. The bolts f are arranged at regular intervals in the pipe, and there are three aligning bolts in a series, arranged in a triangular position around the air-pipe and through the waterjacket.

In practice I make the water-jacket D six inches in diameter and the air-pipe 0 three and ahalf inchesin diameter, although these dimensions may be varied at will. The capacity of the combined air-jets a and I) should begreater than that of the air-pipe C, so that when air -is forced through the pipe under great pressure it will not pass through the jets with sufficient force to scatter the ore.

Having thus fully described my invention, 'I claim as new and desire to secure by Letters Patent .1. An apparatus of the character described, consisting in a revoluble furnace having end openings therein, a water-jacket extending through the furnace, having a reducer and discharge-pipe at each end thereof, a water-supply pipe opening into the central portion of the Water-jacket, an air-pipe within the said jacket, having one end closed, as shown, and air-jets projecting from the air-pipe and through the water-jacket, substantially as described.

2. In an apparatus of the character described, the combination, with an air-pipe extending through the furnace, having one end stopped, as shown, and a water-jacket inclosing the said air-pipe,of jets opening from the air-pipe and through the bottom and sides of the water-jacket, said jets being formed of hollow nipples having beveled screw-threaded ends, substantially as shown and described.

3. An apparatus of the characterdescribed, comprising a revoluble furnace having end openings therein, a water-jacket extending through the furnace, having a discharge-pipe at each end, a water-supply pipe opening into the central portion of the Water-jacket, an air-pipe within the waterjacket, having one end closed and having jets opening through the water-jacket, and bolts extending through the Water-jacket to a contact with the airpipe, all substantially as described.

EDWIN M. CLARK. \Vitnesses:

W. E. DARLING, ELMER HUGHES. 

